<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    // function getSum(arr = []) {
    //   let sum = 0
    //   for (let i = 0; i < arr.length; i++) {
    //     sum += arr[i]
    //   }
    //   console.log(sum)
    // }
    // getSum([20, 30, 50])


    function getSum(x, n) {
      return x + n
    }
    let sdd = getSum()
    console.log(sdd);

  </script>
</body>

</html>